/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.mpp.plan.statement.crud;

import org.apache.iotdb.commons.path.PartialPath;
import org.apache.iotdb.db.conf.IoTDBDescriptor;
import org.apache.iotdb.db.engine.storagegroup.TsFileResource;
import org.apache.iotdb.db.mpp.plan.statement.Statement;
import org.apache.iotdb.db.mpp.plan.statement.StatementType;
import org.apache.iotdb.db.mpp.plan.statement.StatementVisitor;
import org.apache.iotdb.tsfile.common.constant.TsFileConstant;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class LoadTsFileStatement extends Statement {
    private File file;
    private int sgLevel;
    private boolean verifySchema;
    private boolean deleteAfterLoad;
    private boolean autoCreateDatabase;

    private List<File> tsFiles;
    private List<TsFileResource> resources;

    public LoadTsFileStatement(String filePath) throws FileNotFoundException {
        this.file = new File(filePath);
        this.sgLevel = IoTDBDescriptor.getInstance().getConfig().getDefaultStorageGroupLevel();
        this.verifySchema = true;
        this.deleteAfterLoad = true;
        this.autoCreateDatabase = IoTDBDescriptor.getInstance().getConfig().isAutoCreateSchemaEnabled();
        this.tsFiles = new ArrayList<>();
        this.resources = new ArrayList<>();
        this.statementType = StatementType.MULTI_BATCH_INSERT;

        if (file.isFile()) {
            tsFiles.add(file);
        } else {
            if (file.listFiles() == null) {
                throw new FileNotFoundException(
                        String.format(
                                "Can not find %s on this machine, notice that load can only handle files on this machine.",
                                filePath));
            }
            findAllTsFile(file);
        }
        sortTsFiles(tsFiles);
    }

    private void findAllTsFile(File file) {
        for (File nowFile : file.listFiles()) {
            if (nowFile.getName().endsWith(TsFileConstant.TSFILE_SUFFIX)) {
                tsFiles.add(nowFile);
            } else if (nowFile.isDirectory()) {
                findAllTsFile(nowFile);
            }
        }
    }

    private void sortTsFiles(List<File> files) {
        files.sort(
                (o1, o2) -> {
                    String file1Name = o1.getName();
                    String file2Name = o2.getName();
                    try {
                        return TsFileResource.checkAndCompareFileName(file1Name, file2Name);
                    } catch (IOException e) {
                        return file1Name.compareTo(file2Name);
                    }
                });
    }

    public void setDeleteAfterLoad(boolean deleteAfterLoad) {
        this.deleteAfterLoad = deleteAfterLoad;
    }

    public void setSgLevel(int sgLevel) {
        this.sgLevel = sgLevel;
    }

    public void setVerifySchema(boolean verifySchema) {
        this.verifySchema = verifySchema;
    }

    public void setAutoCreateDatabase(boolean autoCreateDatabase) {
        this.autoCreateDatabase = autoCreateDatabase;
    }

    public boolean isVerifySchema() {
        return verifySchema;
    }

    public boolean isDeleteAfterLoad() {
        return deleteAfterLoad;
    }

    public boolean isAutoCreateDatabase() {
        return autoCreateDatabase;
    }

    public int getSgLevel() {
        return sgLevel;
    }

    public List<File> getTsFiles() {
        return tsFiles;
    }

    public void addTsFileResource(TsFileResource resource) {
        resources.add(resource);
    }

    public List<TsFileResource> getResources() {
        return resources;
    }

    @Override
    public List<? extends PartialPath> getPaths() {
        return Collections.emptyList();
    }

    @Override
    public <R, C> R accept(StatementVisitor<R, C> visitor, C context) {
        return visitor.visitLoadFile(this, context);
    }

    @Override
    public String toString() {
        return "LoadTsFileStatement{"
                + "file="
                + file
                + ", deleteAfterLoad="
                + deleteAfterLoad
                + ", sgLevel="
                + sgLevel
                + ", verifySchema="
                + verifySchema
                + ", tsFiles Size="
                + tsFiles.size()
                + '}';
    }
}
